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|Born: September 17, 1956|
|June 29, 1977, for the California Angels|
|Last MLB appearance|
|May 30, 1990, for the Texas Rangers|
|Runs batted in||158|
Thaddis Bosley Jr. (born September 17, 1956) is a former Major League Baseball outfielder for the California Angels (1977, 1988), Chicago White Sox (1978–1980), Milwaukee Brewers (1981), Seattle Mariners (1982), Chicago Cubs (1983–1986), Kansas City Royals (1987–1988) and Texas Rangers (1989–1990).
Bosley was called up to the Angels after hitting .326 in 69 games for the Salt Lake City Gulls of the Pacific Coast League (PCL), and made his Major League debut on June 29, 1977. Bosley was traded in the off-season to the Chicago White Sox with Richard Dotson and Bobby Bonds. He remained with the White Sox organization for three years and later played for the Milwaukee Brewers, Seattle Mariners, and Chicago Cubs, distinguishing himself as one of the best pinch hitters in the majors. During the 1985 season, Bosley hit .328 and was voted the best pinch hitter in baseball. After being traded to the Kansas City Royals in 1987, Bosley returned again to the California Angels in 1988. In 1989, he signed with the Texas Rangers and ended his playing career on June 1, 1990.
He appeared with two division champions, the 1981 Brewers and the 1984 Cubs. Both teams lost their respective League Championship Series, however, so Bosley never played in a World Series. Bosley played fourteen major-league seasons, appearing in 784 games with 1,581 at-bats, a .272 batting average and twenty home runs.
Bosley was a coach for the Oakland Athletics from 1999 to 2002. During the 2008 and 2009 seasons Bosley served as an assistant coach and then as the head coach for the baseball team at the now defunct Bethany University in Scotts Valley, California. Bosley was announced on June 24, 2009, as the head coach at Southwestern College in Phoenix, Arizona. After one season at Southwestern, Bosley accepted the hitting coach vacancy for the most recent American League champion, the Texas Rangers on November 23, 2010. He was fired as the Rangers hitting coach on June 8, 2011.
Bosley was briefly a member of a funk group called Ballplayers which featured former Major League Baseball journeyman Lenny Randle. Some of their music can be heard on a compilation called "Family Album", which was released in 2010 on the DC-based music label, People's Potential Family.
- "National League Roundup : Bosley Is Right Man in the Pinch for Cubs as They Edge Montreal". Los Angeles Times. 13 August 1985. Retrieved 23 September 2016.
- Caplan, Jeff (24 November 2010). "Rangers hire hitting coach Thad Bosley". ESPN. Retrieved 23 September 2016.